W-4 Calculator
Compare your actual 2026 federal tax liability against your current withholding to see exactly how much extra to withhold per paycheck — or how much less. Uses 2026 IRS brackets, the $2,000 Child Tax Credit (made permanent by OBBBA), and the $500 Credit for Other Dependents.
Last updated: April 2026 · Source: IRS Form W-4 (2026), IRS Publication 15-T, OBBBA (July 2025)
From your most recent paystub (YTD × periods per year)
Frequently asked questions
What is Form W-4?
IRS Form W-4 (Employee Withholding Certificate) is the document you submit to your employer to tell them how much federal income tax to withhold from each paycheck. The form was significantly redesigned in 2020 to eliminate the confusing "allowances" system. The current W-4 has five steps: (1) personal info and filing status, (2) multiple jobs adjustment, (3) dependents and credits, (4) other adjustments (additional income, deductions, extra withholding), and (5) signature.
How does the 2020+ W-4 differ from the old version?
The old W-4 used "allowances" — a confusing concept where more allowances meant less withholding. The redesigned form (2020 to present) removed allowances entirely and instead asks you to directly report income, dependents, and adjustments in dollar amounts. It is more accurate but requires you to know more specific numbers. The IRS provides a free Tax Withholding Estimator tool to help, which this calculator approximates.
Should I aim for a big refund or zero balance?
Mathematically, zero balance is optimal because a refund means you gave the federal government an interest-free loan for up to a year. That refund money could have been in your bank account earning interest (5% in a high-yield savings account in early 2026), paying down debt, or invested. However, many people use over-withholding as forced savings, and that behavioral benefit has value. Zero-balance is the math answer; modest refunds are the psychology answer.
What is the Child Tax Credit for 2026?
The 2026 Child Tax Credit is $2,000 per qualifying child under age 17 with a valid Social Security number. The OBBBA (One Big Beautiful Bill Act, enacted July 4, 2025) made the $2,000 per-child credit permanent. Up to $1,700 of the credit is refundable (the Additional Child Tax Credit) for filers who owe less tax than the credit amount. The credit phases out at $200,000 for single filers and $400,000 for married filing jointly.
What is the Credit for Other Dependents?
The Credit for Other Dependents (ODC) is a non-refundable $500 credit for dependents who do not qualify for the Child Tax Credit — typically children age 17+ who still live with you, college-age dependents, or qualifying relatives like elderly parents. The ODC has the same income phase-outs as the CTC ($200,000 single / $400,000 MFJ). It was created as part of the 2017 TCJA.
How do I fill out W-4 Step 2 for multiple jobs?
If you have more than one job — or your spouse works and you file jointly — use Step 2 of the W-4 to ensure accurate withholding. There are three options: (1) Use the IRS Tax Withholding Estimator online (most accurate), (2) use the Multiple Jobs Worksheet on page 3 of the W-4 (more involved), or (3) check the box in Step 2(c) if you have exactly two jobs with similar pay (simplest but less accurate). Without this step, each employer withholds as if you only had one job, leading to under-withholding.
What is extra withholding on the W-4?
Step 4(c) of the W-4 lets you request additional withholding per paycheck — a specific dollar amount above what the standard calculation produces. This is useful if you: (1) have significant non-wage income like freelance or investment income, (2) want to catch up on under-withholding mid-year, (3) know you usually owe at tax time, or (4) want to simulate the old "claim zero" behavior. Extra withholding is deducted from every paycheck until you file a new W-4.
What is the 2026 standard deduction?
For 2026: $16,100 for single filers (up from $15,750 in 2025), $32,200 for married filing jointly (up from $31,500), and $24,150 for head of household (up from $23,625). These are the amounts automatically subtracted from your income if you do not itemize. The OBBBA made these TCJA-level amounts permanent, so they will continue to be indexed to inflation rather than reverting to pre-2018 levels.
When should I update my W-4?
Update your W-4 within 10 days of any major life change: marriage, divorce, birth or adoption of a child, a dependent starting or stopping qualifying, a spouse starting or stopping work, a large change in other income, buying a home (mortgage interest deduction), or a significant change in itemized deductions. You should also review your W-4 annually, especially if you had a big refund or owed money the previous year. You can submit a new W-4 to your employer at any time — it takes effect within one or two pay periods.
Does W-4 cover state income tax?
No. Form W-4 only covers federal income tax withholding. Most states have their own withholding certificate — for example, California uses DE 4, New York uses IT-2104, Michigan uses MI-W4. Nine states with no income tax (AK, FL, NV, NH, SD, TN, TX, WA, WY) do not require a state withholding form. If you work in a state different from where you live, you may need to file forms for both states and claim a credit on the home state return.
What if my employer withholds too little and I owe a penalty?
The IRS charges an underpayment penalty if you owe more than $1,000 at tax time and your total withholding plus estimated payments did not meet "safe harbor" rules. The safe harbor is the lesser of: 90% of current-year tax, or 100% of prior-year tax (110% if prior-year AGI exceeded $150,000). If you meet either safe harbor, no penalty applies regardless of how much you owe. The penalty rate is roughly equivalent to the short-term federal rate plus 3% and is prorated quarterly.
What if I am self-employed and have no W-4?
Self-employed individuals do not have W-4s because there is no employer withholding their taxes. Instead, you must make quarterly estimated tax payments using Form 1040-ES by April 15, June 15, September 15, and January 15. You are also responsible for self-employment tax (15.3% on Social Security and Medicare) in addition to income tax. Many self-employed individuals with side businesses and a W-2 job use W-4 Step 4(a) to have extra withheld from their W-2 to cover their SE income tax liability.
Data sources: IRS Form W-4 (2026); IRS Publication 15-T; IRS Revenue Procedure 2025-32 (2026 inflation adjustments); One Big Beautiful Bill Act (OBBBA, enacted July 4, 2025) for permanent TCJA provisions.
Last updated: April 2026.
Disclaimer: This calculator provides estimates and does not replace the IRS Tax Withholding Estimator or professional tax advice. Complex situations (multiple jobs, self-employment, AMT, capital gains) may require more detailed calculation.